Whilst it’s regrettable and annoying the faults your inspector picked up, I’d consider you extremely lucky as the defects you mentioned are more cosmetic than structural. Though annoying nevertheless.
Going it alone is not going to get you anywhere. Organise through your committee to get an inspection of the whole building, and then get the developer to fix the defects.
The building has a 7 year defects period in which the developer has to fix major problems.
The developed is also responsible for paying for a building report, by an inspector of your choice.
But I doubt this covers the costs of the report if you go it alone.
Remeber there is strength in numbers.
your strata manager should be advising you of all this, unless they are indebted to the developer.